Station indicatob



J. c. NELSON STATION INDICATOR Filed May 28. 1923 May r18 1926.

2 Sheets-Sheet 1 INVENTOR @Taka JVZaom N EXT STREET ATTORNY May 18 1926.

, J. c. NELSON STATAION INDICATOR Filed-May' 28, 1923 2 Sheets-Sheet 2 INVENTOR dfkn 'MZsan BY z ATTORNEY Fati-interi May 18, 191%.

Unirse s'rrss 1,584,8dtl

JOHN Cl. NELSON, 0F SEATTLE, WASHINGTON.

STATION INDICATOR.

Application filed May 28, 1923.

My invention relates toimprovements in station indicators and the principal objects ot the invention are to provide a station indicator ot simple, economic, and durable construction whereby the names ot streets or other stops may be successively displayed. to the occupants ot passenger vehicles entirely by automatic means. Other objects are to employ a square prismatie drive roll member which is caused to malte one quarter turns at predetermined intervals by pneumatic torce from the compressed air tank acting through a valve controlled by asolenoid which is energized by switch Contact with the main trolley wire oit said vehicle.

llllith the above and other objects in view which will appear as the description proceeds, vthe invention consists ot the novel construction, adaptation, arrangemt-int and combination ot parte hereinafter described and claimed.

These objects are accomplished by devices illustrated in the a-ooompanyingdrawings, wherein- Figure 'l is a view in ltmgitudinal vertical section of a tr lley car showing the device mounted therein;

Fig. Q, is a vieuT in transverse verticalv sec tion of the saine;

Fig. il is a view in iront elevation of the casingl and contents with the door removed;

Fig. 4tis a view in transverse vertical section `oit the same talren substantially on a broken line 4t, d or Fig. l and showing' the valve and solenoid together with a. diagram oit electric wiring;

Fig. 5 is a detail tragittientary vienT in vertical section of the cylinder, valve and associated parts;

Fig. G is a detail fragmentary view ot the rack, gear and ratchet drive mechanism;

Fig. 7 is a detail vieuT in front elevation ot the trolley connections;

Fig. 8 is a vieuT in side elevation oi? the same; and

Fig. 9 is a detail 'fragmentary view in vertical section of the roll and ehoiviingr the means whereby the edge binding adapted. to hold a display advertising card.

Referring to the drawings, throughout which like reference numerals designate like parts, the numeral 5 designates an ordinary trolley car having the usual compressed air tank 6 mounted under its flooring. A pipe 7 leads from said tank to a three-Way valve 8, The arm 9 of said valve is pivotally con Serial No. 641,949.

nected to a rod l0 of a solenoid ll. A. shunt circuit lil communicates between said sole noid and the contact endA ot a trolley pole lil. The ends ot said circuit are respectively connected with positive and negative brushes 11.4; s ,ated in an iifisulator member 1.5 secured to the arde oi. the trolley shivo 1G. Contact plates 1.7 are secured to and in contact with the trolley Wire 18 usually at the street corners.

When the brushes Ll come in contact with the plates 17 a current will passthroutih and energize the solenoid 1l. The arm 9 and rod l0 will be drawn down to the position shown in dotted lines in liig'. l of the drawings and the three-'way valve 5 Will consequently be turned to the lposition shown tu dotted lines in Fing. 5. lllhen said brushes pass free oit said plates the current will. cease and spring" lil encircling the rod 10 will torce the arm 9 upwardly carryingthe three-- way valve haelt to its normal position.

In its normal position the threewvay valve 8 is open to the tree air through the port El() shown .in Fin'. 5. lllhen said valve is given a one quarter turn said tree air port closed and the passageway through the pipe- 7 is opened permitting the air pressure to pass upwardly trom the tank (l will be understood. The upper end ot' said pipe enters a cylinder E21 mounted within a casino; A. pist-on 23 is operatively mounted Within said cylinder and a piston rod 524i e.\; tends through the top of said cylinder terniinating in a toothed rack A spring); 26 within said cylinder is adapted to normally hold said piston onits seat in the bottom thereoi2 when said three-way valve is open to the tree air, and when air pressure is admitted said piston 'forced upwardly against an annular shoulder 2T within said cylinder.

The rack 25 engages a gear wheel 25% revolvably mounted on a shaft rotatively mounted in the sides ot the casing 2Q. A spring; pawl. 30 is mounted on said oft-:ar and mutaties a ratchet wheel 3l, liredly secured to said shalt. A. square prismatic drive roll. member is also tixedly .mounted on said shaitt and has pins 33 respectively adjacent its tour corners on both end portions thereu of. The tour sides et said square roll 1nem ber are normally parallel with the tout sides of the casing 22 and it will be understood that each complete .movement ot' the piston 23 upwardly against the shoulder 27 will 'iti Ell]

aes und brushes substantially as d'9- B0 111ml. v

JOHN C. NELS() said ard..

g'isel with the uppef poron oi" i119.' p

i8 at each quarter turn O'f The adverlsmg C 

